merge FreeTexture into FreeAndNilTexture

put back the old uteams cleanup, leaks and all, to worry about post-release since my attempt to use DeleteGear was running into the fact that that procedure does way more than just delete a gear. might need an explicit cleanup routine for both to call.

Fix in-flight colouring of land spray, make it use tint when added to land too (lua might find that handy), tweak climbhome cake delay slightly

make sure view limits are updated at start of game

skip a bunch of stuff not applicable to cleanup

Normalize to length of _1_9 to avoid endless normalization leading to fire particles floating midair indefinitely